it was about what law enforcement was supposed to be all about, that's to help people. he was a master at helping people. i think m.i.t. lost someone that truly cared about their community. and i think we lost someone that we learned more from him than he ever learned from us. >> reporter: at 26 years old. >> at 26 years old. >> reporter: says a lot. >> i've been a cop for almost 40 years. you see a lot. you really do. i just never saw anything like this. it's heartbreaking. everything about it is just wrong. killing him was senseless, the loss of a person of his quality, his age, the fact that it happened on a college campus. everything about this is wrong. >> reporter: and, don, also tonight, we talked to three m.i.t. students that are alalso emts and they were close friends of collier. they came with flowers and messages for his family. interestingly what we learned is they not only were close friends of his, but they were the three emt -- student emts on campus that had to respond to the call after his shooting and go to collier. incredibly, incredibly difficult for